Question # 1

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

Which of the following are not known to form compounds in more than one oxidation state?

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Transition metals

Halogens

Alkali metals

Noble gases

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

Which noble gas is used in mixture used for breathing by divers?

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Ge

Ar

Kr

He

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

One of the following does not give the flame test. Which is that

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Sr

Bа

Be

Na

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

Which one of the following elements is not an alkali metal?

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Na

Sr

Cs

Rb

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Which element of group V-A and VII-A does not use d-orbital?

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Nitrogen

Sulphur

Arsenic

Chlorine

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